/*
 * This file is part of Linode Manager Classic.
 *
 * Linode Manager Classic is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Linode Manager Classic is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Linode Manager Classic.  If not, see <https://www.gnu.org/licenses/>.
 */

import { settings, elements, apiGet, apiPost, parseParams, setupHeader } from "/global.js";

(function()
{
	// Element names specific to this page
	elements.disks = "disks";
	elements.drive = "drive";
	elements.filesystems = "filesystems";
	elements.linodeLabel = "linode-label";
	elements.linodeTag = "linode-tag";
	elements.linodeTagLink = "linode-tag-link";
	elements.rescueButton = "rescue-button";
	elements.resetButton = "reset-button";
	elements.rootPass = "root-pass";
	elements.sda = "sda";
	elements.sdb = "sdb";
	elements.sdc = "sdc";
	elements.sdd = "sdd";
	elements.sde = "sde";
	elements.sdf = "sdf";
	elements.sdg = "sdg";
	elements.volumes = "volumes";

	// Data received from API calls
	var data = {};
	data.disks = [];
	data.linode = {};
	data.volumes = [];

	// Static references to UI elements
	var ui = {};
	ui.disks = [];
	ui.drive = [];
	ui.filesystems = {};
	ui.linodeLabel = {};
	ui.linodeTag = {};
	ui.linodeTagLink = {};
	ui.rescueButton = {};
	ui.resetButton = {};
	ui.rootPass = {};
	ui.sda = {};
	ui.sdb = {};
	ui.sdc = {};
	ui.sdd = {};
	ui.sde = {};
	ui.sdf = {};
	ui.sdg = {};
	ui.volumes = [];

	// Callback for linode details API call
	var displayDetails = function(response)
	{
		data.linode = response;

		// Set page title and header stuff
		document.title += " // " + data.linode.label;
		ui.linodeLabel.innerHTML = data.linode.label;
		if (data.linode.tags.length == 1) {
			ui.linodeTagLink.href = "/linodes?tag=" + data.linode.tags[0];
			ui.linodeTagLink.innerHTML = "(" + data.linode.tags[0] + ")";
			ui.linodeTag.style.display = "inline";
		} else {
			ui.linodeTag.style.display = "none";
		}

		// Get list of volumes
		apiGet("/volumes", displayVolumes, null);
	};

	// Callback for linode disks API call
	var displayDisks = function(response)
	{
		// Add disks to array
		data.disks = data.disks.concat(response.data);

		// Request the next page if there are more
		if (response.page != response.pages) {
			apiGet("/linode/instances/" + data.params.lid + "/disks?page=" + (response.page + 1), displayDisks, null);
			return;
		}

		// Add disks to drive lists, and disks with filesystems to filesystems list
		for (var i = 0; i < data.disks.length; i++) {
			var disk = document.createElement("option");
			disk.value = "disk-" + data.disks[i].id;
			disk.innerHTML = data.disks[i].label;

			for (var j = 0; j < ui.disks.length; j++)
				ui.disks[j].appendChild(disk.cloneNode(true));

			if (data.disks[i].filesystem.match(/ext3|ext4/))
				ui.filesystems.appendChild(disk.cloneNode(true));
		}

		// Preset value of drive lists
		for (var i = 0; i < data.disks.length && i < ui.drive.length; i++)
			ui.drive[i].value = "disk-" + data.disks[i].id;

		if (ui.filesystems.childNodes.length > 0)
			ui.resetButton.disabled = false;
	};

	// Callback for volumes API call
	var displayVolumes = function(response)
	{
		// Add volumes to array
		data.volumes = data.volumes.concat(response.data);

		// Request the next page if there are more
		if (response.page != response.pages) {
			apiGet("/volumes?page=" + (response.page + 1), displayVolumes, null);
			return;
		}

		// Add volumes from this Linode's region to drive lists
		for (var i = 0; i < data.volumes.length; i++) {
			if (data.volumes[i].region != data.linode.region)
				continue;

			var volume = document.createElement("option");
			volume.value = "volume-" + data.volumes[i].id;
			volume.innerHTML = data.volumes[i].label;
			for (var j = 0; j < ui.volumes.length; j++)
				ui.volumes[j].appendChild(volume.cloneNode(true));
		}

		ui.rescueButton.disabled = false;
	};

	// Rescue button handler
	var handleRescue = function(event)
	{
		if (event.currentTarget.disabled)
			return;

		var request = {
			"devices": {}
		};

		if (ui.sda.value.startsWith("disk-"))
			request.devices.sda = { "disk_id": parseInt(ui.sda.value.split("-")[1]) };
		else if (ui.sda.value.startsWith("volume-"))
			request.devices.sda = { "volume_id": parseInt(ui.sda.value.split("-")[1]) };

		if (ui.sdb.value.startsWith("disk-"))
			request.devices.sdb = { "disk_id": parseInt(ui.sdb.value.split("-")[1]) };
		else if (ui.sdb.value.startsWith("volume-"))
			request.devices.sdb = { "volume_id": parseInt(ui.sdb.value.split("-")[1]) };

		if (ui.sdc.value.startsWith("disk-"))
			request.devices.sdc = { "disk_id": parseInt(ui.sdc.value.split("-")[1]) };
		else if (ui.sdc.value.startsWith("volume-"))
			request.devices.sdc = { "volume_id": parseInt(ui.sdc.value.split("-")[1]) };

		if (ui.sdd.value.startsWith("disk-"))
			request.devices.sdd = { "disk_id": parseInt(ui.sdd.value.split("-")[1]) };
		else if (ui.sdd.value.startsWith("volume-"))
			request.devices.sdd = { "volume_id": parseInt(ui.sdd.value.split("-")[1]) };

		if (ui.sde.value.startsWith("disk-"))
			request.devices.sde = { "disk_id": parseInt(ui.sde.value.split("-")[1]) };
		else if (ui.sde.value.startsWith("volume-"))
			request.devices.sde = { "volume_id": parseInt(ui.sde.value.split("-")[1]) };

		if (ui.sdf.value.startsWith("disk-"))
			request.devices.sdf = { "disk_id": parseInt(ui.sdf.value.split("-")[1]) };
		else if (ui.sdf.value.startsWith("volume-"))
			request.devices.sdf = { "volume_id": parseInt(ui.sdf.value.split("-")[1]) };

		if (ui.sdg.value.startsWith("disk-"))
			request.devices.sdg = { "disk_id": parseInt(ui.sdg.value.split("-")[1]) };
		else if (ui.sdg.value.startsWith("volume-"))
			request.devices.sdg = { "volume_id": parseInt(ui.sdg.value.split("-")[1]) };

		apiPost("/linode/instances/" + data.params.lid + "/rescue", request, function(response)
		{
			location.href = "/linodes/dashboard?lid=" + data.params.lid;
		});
	};

	// Reset button handler
	var handleReset = function(event)
	{
		if (event.currentTarget.disabled)
			return;

		if (ui.rootPass.value.length == 0) {
			alert("You must supply a root password.");
			return;
		}

		var request = {
			"password": ui.rootPass.value
		};

		apiPost("/linode/instances/" + data.params.lid + "/disks/" + ui.filesystems.value.split("-")[1] + "/password", request, function(response)
		{
			location.href = "/linodes/dashboard?lid=" + data.params.lid;
		});
	};

	// Initial setup
	var setup = function()
	{
		// Parse URL parameters
		data.params = parseParams();

		// We need a Linode ID, so die if we don't have it
		if (!data.params.lid) {
			alert("No Linode ID supplied!");
			return;
		}

		setupHeader();

		// Update links on page to include proper Linode ID
		var anchors = document.getElementsByTagName("a");
		for (var i = 0; i < anchors.length; i++)
			anchors[i].href = anchors[i].href.replace("lid=0", "lid=" + data.params.lid);

		// Get element references
		ui.disks = document.getElementsByClassName(elements.disks);
		ui.drive = document.getElementsByClassName(elements.drive);
		ui.filesystems = document.getElementById(elements.filesystems);
		ui.linodeLabel = document.getElementById(elements.linodeLabel);
		ui.linodeTag = document.getElementById(elements.linodeTag);
		ui.linodeTagLink = document.getElementById(elements.linodeTagLink);
		ui.rescueButton = document.getElementById(elements.rescueButton);
		ui.resetButton = document.getElementById(elements.resetButton);
		ui.rootPass = document.getElementById(elements.rootPass);
		ui.sda = document.getElementById(elements.sda);
		ui.sdb = document.getElementById(elements.sdb);
		ui.sdc = document.getElementById(elements.sdc);
		ui.sdd = document.getElementById(elements.sdd);
		ui.sde = document.getElementById(elements.sde);
		ui.sdf = document.getElementById(elements.sdf);
		ui.sdg = document.getElementById(elements.sdg);
		ui.volumes = document.getElementsByClassName(elements.volumes);

		// Register button handlers
		ui.rescueButton.addEventListener("click", handleRescue);
		ui.resetButton.addEventListener("click", handleReset);

		// Get data from API
		apiGet("/linode/instances/" + data.params.lid, displayDetails, null);
		apiGet("/linode/instances/" + data.params.lid + "/disks", displayDisks, null);
	};

	// Attach onload handler
	window.addEventListener("load", setup);
})();